/Engine/Source/Runtime/Datasmith/CADKernel/Public/CADKernel/Geo/Sampling/PolylineTools.h
Evaluate the point of the polyline at the input Coordinate If the input coordinate is outside the boundary of the polyline, the coordinate of the nearest boundary is used.
template<class CurvePointType> void ApproximatePoint ( double InCoordinate, CurvePointType & OutPoint, int32 InDerivativeOrder ) const